Machine for feeding sand to molding-flasks



E. R. DUNSFOR'D. MACHINE'FOR FEEDING SAND T0 MOLDlN-G FLASKS.APPLICATION FILED MAY 27| 1919.

1,329,459. Patente@ Feb.3',1920.

2 SHEETS-SHEET' l- E. R. nuNsFoHn.

- MACHINE FOR FEEDING'SAND T0 MOL'DING FLASKS.

APPLICATION FILED MAY 27.1919.

1,329,459, Patented Feb. 3,1920.

2 SHEETS-SHEET 2.

f. l EMEIs RDUNsEo'nn, or ALLIANCE, oiiro.

MACHINE FOR FEEDING SANII'.)I TOxlVIOLIIING-FLASKS.

Application led May 27, 1919. VSerial No. 300,018.

To all 'whom t may concern;

Be it known that I, EMEIS a citizen of the United States, residing R.DUsFoRD, at

4 Alliance, in the county of vStark and State of Ohio, have inventedcertain new and useful Improvements in Machines for Feeding Sand to`Molding-Flasks, of which the following is a specification.

This inventiond relates to that type of machines or apparatus which areemployed to feed sand to molding iiasks and which supply the sand bycentrifugal force at a high speed so that it will be firmly andcompactly deposited and built up within the flask.I

The object of the present invention is to simplify the construction andimprove the mounting of the machine whereby the cost of assembling andoperating will be reduced and the feeding member more effectivelybalanced than isthe case w-ith prior machines and the sand fed to themold more rapidly and evenly than heretofore.

The invention is illustrated in the accompanying drawingsl and 'will behereinafter fully described, the novel features being subsequentlypointed out in the appended claims.

In the drawings: Figure lis a view partly in side elevation and partlyin vertical section of an apparatus embodying my improvements;

Fig. 2 is a front elevation of that portion of the apparatus whlchacts'directly on the sand; i

Fig. 3 is an enlarged transverse section of the mechanism shown in Fig.2;

Fig. 4 is an enlarged front elevation of the same with thecoverplateremoved and some of the securing bolts shown in section.

In carrying out my invention, I employ a pedestal 1 which is constructedwith a suitable base 2 adapted to be securedto a rigid or fixed supportand lmay be perma# nently bolted or otherwise anchored to the floor ofthe molding room. This pedestal is provided on one side with theforwardly projectingarms 3 and with a cup 4 `said members constitutingsupports for a post or vertical shaft 5 which may be securedin thepedestal but will preferably be mounted for rotation within the arms 3and in the cup 4, bushings 6 being provided in the arms?, and a stepbearing7 being provided in the cup 4 to receive the thrust. Secured toor pivotally mounted upon the member 5 is an armShaving its rear endconstructed" Specification of Letters Patent.

Patented Fens, 1920;

into a yoke 10 providing upper and lower bearing members 11 to receive abolt or rodl 12 upon which is pivotally mounted a sleeve or hub 13 uponthe rear end of the motor lsupport 14, the said hub being fitted betweenthe members 11, as clearly shown in Fig. 1, and securing nuts 15 beingmounted upon the ends of the pin or rod ,12 and turned home against thebearing members 11 to secure the said rod firmly in place. A motor 16,preferably driven by electricity, is secured to the support 14 and thecasingof said motor Ais constructed with an elongated sleeve or hollowsupporting arm 17` which projects forwardly therefrom and incloses themotor shaft 18. A bushing 19 is fitted in the outer end of the sleeve orhousing 17 to furnish a proper bearing for the motor shaft and upon theouter side of the said sleeve 17, at the front end thereof, I secure orform the back wall 20 of a casing within which the feeding memberrotates. A chute or hopper 21 is secured upon the upper portion of theback wall 20 and y the sand is fed into the said chute or hopper byany'convenient' form of conveyer, which is not illustrated herein as itforms no part of mypresent invention. It is to be under;

stood that the hopper l.or chute should be of such dimensions or soconnected with the conveyer that the shifting of the feeding elements toproperly positionthe sand with- `in the molding flasks will notinterfere with the proper delivery of ysand to the chute or hopper.`Secured firmly to the front. ex'- tremity of the motor shaft 18 isthe-"hub 22 of a disk or other rotary member 23 which disk is providedat its periphery with a forwardly projecting rim or annular flange 24which is reinforced and strengthened by spokes or braces 25/ extendingtween the said rim and the hub 22. The disk 23 also carries a deflectoror sand dinl .recting member consisting of a rearwardly flared ring 26extending from the periphery indicated at 42;?, of thecasing are formedintegral withgand project forwardly from the back wall 20, one of saidwalls being vertical `and the other wall having a lower curved portion,asfindicated at 28, and ter-y minating in a short horizontal floor orflange 29 which has its end or edge spaced from the lower extremity ofthe vertical straight end wall thereby providing ar discharge opening 30through which. the sand may l passto the-flask. The front wall of thecasing consists of a cover plate which pref- A erably consists of anupper member 31 and Aa lower member 32 having straight'meeting edgeswhich are adapted to abut in the hori.

y-zontal plane of the motor shaft 18 and which are constructed withcentral concave ynotches or openings 33 corresponding in I diameter' to'the diameter of the disk 23.

This construction will expose the spokes of the sand feeding member sothat the operator may at all times observe the rotation of the saidmember and be informed as to the evenness of its action. provides readyaccess tothe inner securing bolts by which the sand-throwing vshoes aresecured in position. The cover plates conform in outline to the endwalls ofl the casing and are secured thereto by bolts pass:

ing through their edges and through flanges .At the upper ex- 34 on theend walls. tremities of the end walls, I provide inwardly projectingbosses 35 through which other fastening bolts are inserted to secure the'upper portion of the cover plate in position. The top of the casing iscovered by a shield consisting of an arcuate web 36 having a verticalflange 37 at its front edge tting against the upper cover plate 31 andsecured thereto .by bolts 38. The' flange 37 terminatesadjacent thebosses 35V and the rear e fre ofthe web 36 is disposed close to themouth of the chute or hopper 21 so that the. liability of sand flyinover or beyond the sand-.throwing mem' -r will -be .minimized The web36, as shown most clearly in Fig. 4, terminates at one -side adjacentthe boss 35 but at its other side extends tothe horizontal plane of themotor shaft so that it will serve `as a guide for` the sand andwillprevent the same leaving the shoe until theshoe has reacheda pointvertically over the discharge opening 30. The curved end wall of thecasing is n provided with an opening 39 whichiwill per- 4 mit accesstothe upper securing bolts of the shoes and will also permitthe`inserti'on of a suitable too-Lshould there be any .accidentalchoking of the apparatus by reason of sand leaking past the shoes as thesame move across the mouth Aof the hopper 'or chute. Q

At intervals around the rim 24 of the sand-throwing member, I providethe approximately radial curved arms 40 which It also vextend outwardlyfrom the' rim and are re-` inforced by ribs or webs 41 connecting their4 convex or rear faces with the rim 24.- The sand-throwing shoes arecarried by these arms and in the presenti embodiment of my invention I'have illustrated three of such arms spaced eqidistantly around theJ diskso-that the disk will be balanced and 4will run easily and evenlywithout the employf ment of any additional weights or othercounterbalances. The employment of three of said arms with thecorresponding number of shoes is advantageous for the reason that thesand is carried around the wheel or feeding member through one-third ofits rotation andl by employing three shoes spaced equidistantly thesand' is fed con-f stantly instead of being fed only one-third of thetime. vA greater or less number of shoes, however, may, be employedwithout departing from the principles of my invention as the same isdefined in the appended claims.

While the convex faces of the` arms 40 might -be utilized Aas the sandengaging and throwing elements, I prefer to employ the shoes illustratedin the drawings. These'- shoes consist of arcuate base members 42 ttingclosely against the concave surfaces of the arms 40 and provided attheir rear ,edges 'with wings, ianges, or'blades 43 which in Itisthought the operation of the ma chine will be readily understood fromwhat has gone before, but it ma be briefly summarized. The disk orfeeding member 23 is rotated in the direction of the arrow appearingupon Fig. 4 and will move at ahigh speed so that the passage of theshoes across the mouth ofthe hopper or chute 21 ywill be sorapid as to'be practically rcontinuous.' As each kshoe moves across the'mouth ofthe hopper or chute it will cut ofi' a portion of the sand and willforce, the same around through'the conduit provided bythe front and rearwalls Aof the-casing, the web 36 and the rim locity of the shoes" issuch that the sand will require a very high momentum as it travelsv pastthe web 36 and will be thrown from'the casing through the dischargeopening 30 24 of the rotary feeding memberv until the body of sand hasnearly reached the terminal of the said web 36. The ve.

with great force so that by reason of its impact with the bottom of theflask, or the pattern, or the sand previously deposited n.

- Lezama the aslrs, it will be very rmly seated so that a very firm moldwill be rapidly formed and the mold cavity very accurately shaped. Thejointed construction of the support for thesand-throwingorfeedingmechanism permits the said'mechanism'to be moved over the area of themolding flasks and, consequently, the operator is enabled to govern thedischarge of the sand so that it w1ll be deposited at such` pointswithin the flask as it may be needed. The construction devised by mereduces the number of parts which have heretofore been found necessaryin building machines for feeding sand centrifugally into molding flasksand thereby facilitates the setting up or disassembling of the machineand reduces the cost of installing and maintaining the machines. over,the construction which I employ permits the sand feeding or throwingelements to operate evenly at a higher speed than has heretofore beenattainable and therefore re- 'ducesthe cost ofthe molding operation by.permitting the production of more molds within a given period. l

Having thus described the invention, what is claimed as new is: l

1. mechanism for the purpose set forth, the combination of a. jointedsupport, a motor carried by said support, a casing connected with saidsupport, and a sand-throwing member disposed within said casing Vandoperatively connected with the motor.

' end of said arm and arranged to have` 2. In an apparatus for the.`purpose set forth, the com ination of a rigid supporting member, alaterally extending arm mounted on said support for swinging movement, amotor support carried by the outer swinging movement r relative thereto,a motor, and a sand-throwing member oper-- atively connected with saidmotor, both carried by the motor support.

3. In an apparatus for the purpose set forth, the combination of apedestal, bearing arms projecting from said pedestal in spaced relation,a cup-,disposed at the base of the pedestal, -a step bearing in saidcup, a pivot member mounted in the spaced bearing arms and tting withinsaid cup to be supported by the step bearing, alaterally extending armfitted upon said pivot member between the spaced bearing arms forlateral Swingin movement, a yoke at the free end of sai arm, a motorcarrier having a hub member fitted within said yoke, means for securingsaid hub-within the yoke for swinging movement, a'jcasimg secured to themotor carrier,`

a, motor mounted within the said easing, and a sand-throwing member alsomounted within the casing and operatively connected with the motor. y

4. In an apparatus for the purpose set"v forth, the combination ofacasing having a discharge opening in its bottom, means for supplyingsand at the top of the casing, and means for forcibly projecting thesand from the casing comprising a rotatable.

member, and a plurality of equidistant sand engaging elements carriedthereby.

Ymeans for forcibly projecting thesand from thelcasing bonsisting of aplurality of sandengagin the san -feeding means, and means for rapidlyand successively moving said elements past the sand-feeding means.

7.111 an yapparatus for the purpose "set forth, the combination of acasing having a one wall formed by a web having one terminal disposedto" guide sand to the` discharge opening, means for feeding sand at saidelements arranged to move past -discharge opening at one side .andhaving l an intermediate point of said web, and a' vplurality ofsand-engaging elements movable successively and rapidly past thesandfeeding Ineansl and theI discharge opening.

8. In anapparatus for the` purpose set forth, the combination of acasing, means for feeding sand thereto, and a sand-throw ing meanscomprising al member mounted for rotation within the case, and aplurality of shoes secured upon the periphery vof said rotatable memberand comprising anA ar- .curate web disposedapproximately radial to themember, and a wing at the rear edge rection of movement. e

9. Inan apparatus for the purpose set forth,l the combination of acasing, a chute supported on and extending into the casing, arotatablemember mounted in the casing and having a' rearwardlyflared`ring eX- tending under' the said chute, and sandthrowing members carriedby said rotatable member and movable past thev chute. j

10.In an apparatusfor thefpurpose )set forth, the combination of acasing comprisinga rear wall and end walls projecting` forwardlytherefrom, one of said end walls bemg provided vwith an opening, a coversecured to the said end walls and forming the from the cover, said topplate comprising` an arcuate web having its terminals dis-- front of thesaid casing, a top plate secured to said cover and extending, rearwardly70 5. In an apparatus for theV purpose set 110 of said web extendingtherefrom inthe di- )rear edge of said web and the rear wall of thecasing, and a rotatable member mounted within'tlle casing andk providedwith a sand- Ithrowing element extending to the said web and movablepast the sand-feeding means.

11. In an apparatus for Vthe purpose set forth,A thel combination of aeasing having an open bottom land provided with a top 10 plate havingits 'ends disposed between the end walls ,of the easing, a rotatablemember mounted within the casing and providedwith an approximatelyradial arm projecting close -to the top plate, vand a shoe remov- 15ably secured to said arm.

vIn testimony whereof I affix my signature.v l

.EMEIS n. DUNsFoRD. [a 8.]

